Ph Of NaOH: 7 Factors You Should Know!

What is the pH of NaOH?

The pH of NaOH (sodium hydroxide) is approximately 14. NaOH is a strong base, which means it completely dissociates in water to produce hydroxide ions (OH) that can accept protons (H+) from water molecules. 

The pH of NaOH Vs. Other Bases

The pH of NaOH and some other common bases are mentioned below.

BasepH Value
Sodium hydroxide14.0
Magnesia10.5
Sodium acetate 8.9
Trisodium phosphate12.0
Potassium cyanide11.0
Ferrous hydroxide9.5
Potassium hydroxide14.0
Barbital sodium9.4
Sodium sesquicarbonate10.1
Calcium hydroxide12.4

What are the implications of the pH of NaOH?

The basicity of NaOH has significant key implications. They are:

Industrial Implications

  • NaOH is commonly used in the production of various chemicals, such as paper, textiles, and soap
  • The high pH of NaOH can help to break down organic materials and facilitate chemical reactions

Laboratory Implications

  • NaOH is often used as a reagent or titrant in chemical experiments
  • Its high pH can be beneficial in these applications because it can neutralize acidic substances and help to maintain a consistent pH environment

Safety Implications

  • The high pH of NaOH can be dangerous and corrosive to human skin and other materials
  • It is important to handle NaOH with care and to use appropriate safety equipment such as gloves and eye protection when working with it

Why is the pH of NaOH important?

NaOH is a strong base that neutralises acidic solutions by accepting hydrogen ions. The resulting shift in pH affects the behaviour of substances in a solution and impacts various processes, such as chemical reactions and wastewater treatment. The pH of NaOH is crucial for understanding its chemical and physical properties.

Factors Affecting the pH of NaOH

Multiple factors that affect the behaviour of NaOH are mentioned below.

  1. Concentration: The pH of a NaOH solution increases as its concentration increases. This is because the concentration of hydroxide ions (OH) increases in the solution.
  2. Temperature: The pH of the NaOH solution is also affected by temperature. At higher temperatures, NaOH tends to dissociate more easily, increasing the concentration of hydroxide ions and raising the pH.
  3. Impurities: Impurities in NaOH can affect its pH. For example, if NaOH contains impurities that are acidic, they can lower the pH of the solution.
  4. Atmospheric carbon dioxide: Carbon dioxide in the air can dissolve in NaOH solution, forming carbonic acid (H2CO3), which can lower the pH of the solution.
  5. Contact with acidic substances: If NaOH solution comes into contact with acidic substances, the acidity of the solution will increase, leading to a decrease in pH.
  6. Dilution: When NaOH is diluted with water, the concentration of hydroxide ions decreases, resulting in a lower pH.

About the author

I am Leena Raswant, a chemistry postgraduate. I thrive on challenges and continually specified goals. I aim to learn, unlearn, relearn and spread my knowledge in the best possible ways.

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